C# find same items in two lists
WebFeb 24, 2024 · 1 Answer. Sorted by: 3. Override Equals and GetHashCode in your Sale class and then use Intersect method from LINQ: List existInBoth = sales.Intersect (salesDuplicate).ToList (); You can also provide you own comparer to it, so you don't have to override Equals. Share. WebJun 16, 2024 · My problem is that I need to compare two lists and find amount of objects that share same field's value. Kind a find common objects of two lists, or some join operation. I don't want to use Linq as later I'd need access to indexes of elements, but for now the classes/methods are simplified. Class Pip:
C# find same items in two lists
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WebOct 9, 2012 · var inListButNotInList2 = list.Except (list2); var inList2ButNotInList = list2.Except (list); This method is implemented by using deferred execution. That means you could write for example: var first10 = inListButNotInList2.Take (10); It is also efficient since it internally uses a Set to compare the objects. WebJun 27, 2011 · Here's a function that will take a dictionary, remove any string that is in more than one list in the dictionary, and return the list of strings it removed: static List FindAndRemoveDuplicates (Dictionary> data) { // find duplicates var dupes = new HashSet ( from list1 in data.Values from list2 in data ...
WebJul 22, 2024 · One way is to use a HashSet.You can put the items of the first collection in the hash, then iterate each collection after the first and create an new hash that you add items from the current collection to if it's in the hash. WebDownload Run Code. 3. Using HashSet.SetEquals Method. An alternative idea is to call the HashSet.SetEquals method, which returns true if a HashSet object and the specified collection contain the same elements. However, this would need to convert any of the lists to set first. Note that this approach just checks if both lists contain the same elements in …
WebApr 29, 2016 · With LINQ, this is trivial, as you can call the Intersect extension method on the Enumerable class to give you the set intersection of the two arrays:. var intersection = ListA.Intersect(ListB); However, this is the set intersection, meaning if ListA and ListB don't have unique values in it, you won't get any copies. In other words if you have the following: WebAug 27, 2012 · C# Linq, Searching for same items in two lists. we have the following setup: We have a array of objects with a string in it (xml-ish but not normalized) and we have a …
WebJan 14, 2015 · 19. I would say: var products = from product in lstProds join employee in lstEmps on product.SiteId equals employee.SiteId select product; However, if there are multiple employees with the same site ID, you'll get the products multiple times. You could use Distinct to fix this, or build a set of site IDs: var siteIds = new HashSet (lstEmps ... friendship bracelet patterns generatorWebJan 7, 2013 · If you really want to remove them from the existing list, it's slightly harder. It would quite possibly be simplest to work out what the result should look like, then clear and re-add: var newList = list1.Intersect (list2).ToList (); list1.Clear (); list1.AddRange (newList); Of course, all of this does require you to implement equality ... friendship bracelet packsWebI'm having trouble preserving the duplicates when comparing two List objects. The goal is to have the duplicates added to a third list, call it list3. ... list1 has about 5 items, while list2 has 10 items. ... Compare two List in c# and find the duplicates-1. C# how to compare two List and get value of duplicated element ... friendship bracelet pattern generatorWebAug 1, 2012 · Here's the neatest looking LINQ that I can think of to do what you need: var whalesOnly = from w in whales join c in crabs on w.Id equals c.Id into gcs where !gcs.Any() select w; var crabsOnly = from c in crabs join w in whales on c.Id equals w.Id into gws where !gws.Any() select c; fayette county behavioral health gaWebJun 22, 2014 · If you want to know if list2 is contained in list1, use: bool list2InList1 = !list2.Except (list1).Any (); So you had to make both checks if you wanted to ensure that … fayette county behavioral health agencyWebMay 26, 2015 · You can try to use a HashSet to store items from the second list (this will increase your lookup speed) public static int GetDuplicatesCount (List listA, List listB) { var tempB = new … friendship bracelet patterns word generatorWeb50. I'm wondering if Linq has a method to check if two collections have at least a single element in common. I would expect something like this: var listA = new List () { some numbers }; var listB = new List () { some numbers, potentially also in list A }; bool hasSameElements = listA.hasMatchingElements (listB); Does it exists in ... friendship bracelet patterns diy